Temporary download link

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C#

Hi,
i want create a temporary download link:
This is my code:

private void CreateLinkDownloadFile(string strLink)
    {
        // The file path to download.
        string filepath = strLink;//@"C:\shadow_copy.rar";
        // The file name used to save the file to the client's system..
        string filename = Path.GetFileName(filepath);
        try
        {
            System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
            response.ClearContent();
            response.Clear();
            response.ContentType = "application/octet-stream";
            response.AddHeader("Content-Disposition", "attachment; filename=" + filename + ";");
            response.TransmitFile(filepath);
            response.Flush();
            response.End();
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }
    }

and this is error message of IDM:
The web site page instead of a file when IDM requested this file second time. Probably this site uses temporary links and does not allow requesting the same address twice.
Try to delete this download, then start it again from your browser and, when IDM captures it, download it without a stop/pause.